cut the range feature

rfg_adc_plotter/state/ring_buffer.py

@@ -38,6 +38,20 @@ class RingBuffer:
     def fft_symmetric(self) -> bool:
         return self.fft_mode == "symmetric"
 
+    def reset(self) -> None:
+        """Drop all buffered sweeps and derived FFT state."""
+        self.width = 0
+        self.head = 0
+        self.ring = None
+        self.ring_time = None
+        self.ring_fft = None
+        self.x_shared = None
+        self.distance_axis = None
+        self.last_fft_db = None
+        self.last_freqs = None
+        self.y_min_fft = None
+        self.y_max_fft = None
+
     def ensure_init(self, sweep_width: int) -> bool:
         """Allocate or resize buffers. Returns True when geometry changed."""
         target_width = max(int(sweep_width), int(WF_WIDTH))

rfg_adc_plotter/state/runtime_state.py

@@ -14,6 +14,10 @@ from rfg_adc_plotter.types import SweepAuxCurves, SweepInfo
 @dataclass
 class RuntimeState:
     ring: RingBuffer
+    range_min_ghz: float = 0.0
+    range_max_ghz: float = 0.0
+    full_current_freqs: Optional[np.ndarray] = None
+    full_current_sweep_raw: Optional[np.ndarray] = None
     current_freqs: Optional[np.ndarray] = None
     current_distances: Optional[np.ndarray] = None
     current_sweep_raw: Optional[np.ndarray] = None